<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    button {
        /* display: flex;
        justify-content: center; */
        position: absolute;
        margin: 0;
        margin-top: 4opx;
        background-color: orange;
        color:white;
        padding: 10px 20px;
        border-radius: 10;
        cursor: pointer;
        left: 50%;
        top: 50%;
        transform: translate(-50%,-50%)
    }
    body{
        position: relative;
    }
</style>

<body>
    <button>所有餐厅</button>
</body>

</html>